Sewing-machine



(No Model.)-

A. W. BIGELOW.

SEWING MACHINE.

No. 480,229. Patented Aug. 2, 1892.

UNTTED STATES PATENT OFFICE;

AUSTIN IV. BIGELOlV, OF EVERETT, MASSACHUSETTS, ASSIGNOR TO THE GOODYEAR SHOE MACHINERY COMPANY, OF HARTFORD, CONNECTICUT.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 480,229, dated August 2, 1892.

Application filed March 14, 1892. Serial No. 424,824. (No model.)

. To all whom it may concern: pin 01 on the cast-off bar to be engaged by the Be it known that I, AUSTIN W. BIGELOW, of lever c, the spring f, and the friction-plates Everett, county of Middlesex, State of Massag g are and may be all as usual. The abutchusetts, have invented an Improvement in ment a, tapered to fit the beveled outer side 55 5 Wax-Thread Sewing-Machines, of which the of the cast-off bar 1), is made as a part of the following description, in connection with the frame or casting A. The side piece a, havaccompanying drawin gs,is a specification,like in g its edge beveled to fit the bevel of the neeletters on the drawings representinglike parts. dle-bar, is a separate piece into which enters In wax-thread sewingmachines using a two like set-screws m, whose shanks pass 60 1o hooked needle and cast-off it is customary to through elongated holes (shown by dotted bevel what is to constitute the outer sides of lines, Fig. 2) in the casting A. The frame or both the needle-bar and cast-off bar, their concasting A has a post 0, through which is tiguous sides being plane surfaces contacting screwed an adjusting device 0', (shown as a one with the other, the cross-section of the screw,) the end of the screw acting against- 65 contiguous bars forming a figure of dovetailed the side piece a. In this way when by use the shape. These two bars edge to edge are comneedle-bar and cast-off bar become Worn, so monly fitted into a dovetailed guideway, a as to fail to properly draw the loop or so that gib being interposed between the beveled the cast-ofit fails to coact properly with relaedges of one of the said bars and the guidetion to the needle, the set-screws m may be 70 way, which gib is made to take the wear of loosened and the adjusting-screw 0 be turned the needle-bar. In this class of work very in against the side piece a until the latter considerable strain is put on the needle-bar fits the needle-bar as snugly as desired, when in sewing with waxed thread, and as a result the set-screws will be turned in. thereof the bar and gib soon wear, so that the The provision described for confining the 75 2 5 bar is not guided accurately and poor stitchneedle-bar and cast-cit bars in theirguideway ing is the result. enables the running fit between them to be In my experiments to provide against the regulated quickly as desired, and the expense deterioration of the stitching due to looseness of caring for and repairing the machine is and lack of proper fit in the guideway of the materially lessened and the machine is made 8o 0 needle and awl bars I have made one of the to work more satisfactorily,because the means main guide-walls of the framework in which for taking up the wear may be moved so readthe said bars reciprocate as a detached bar caily that the operator will promptly correct pable of being quickly changed in position faults of fit, whereas in the old plan wherein and locked in said position. This constructo provide for wearagib of a certain thickness 85 3 5 tion enables the guideway in which the neehad to be provided the operator was apt to die-bar slides to be adjusted in suitable manneglect the repairs until the last moment. I am aware that a dovetailed bar has been Figure 1 in front elevation shows a sut'fiadapted to reciprocate in a dovetailed guidecient portion of awax-thread sewing-machine way, one side of the guideway having placed 0 40 of well-known construction with my improvein it loosely a thin plate of steel, acted upon ment attached, and Fig. 2 a partial top view near each end by a pointed adjusting-screw, th r of. the said screws being turned and adjusted The metal frame or stand A, having an exindependently in order to keep the gib pressed tension A, the needle-bar n and the cast-oft against the beveled side of the bar. \Vhen a bar I), of the shape best shown in Fig. 2, the gib of this class is used, the operator seldom lever a, spring 0', on which it has its pivot, succeeds in securing uniform pressure of the the pin 01 and stop (2 to turn the lever cat the gib from end to end on the bar, and the gib up-and-down strokes of the needle-bar to thus supported on the points of the screws is free afford the necessary 10st motion between the to adaptitself to inequalities and fails to form too cast-off and needle, the pins (1' d to limit the a rigid and firm guide.

movement of the lever c in one direction, the In my invention one side of the guideway for the needle-bar is made adjustable bodily toward and from the other side of the guide, and a gib-plate is not used. The movable side piece of the guide is made adjustable by a single screw, it serving to set the wall up to the needle-bar firmly and equally, and then to obviate strain on the adjusting device or screw used I clamp the side piece in its adj usted position by the screws m.

I disclaim anything shown in United States Patent of July 27, 1880, No. 230,580.

Having described my invention, what I claim, and desire to secure by Letters Patent, is-

In a sewing-machine, the frame or casting A, having a side piece a, forming one half of a guideway, and a detachable side piece a,

forming the other half of the guideway, a

Witnesses GEo. W. GREGORY, EMMA J. BENNETT. 

